/*
 * Essential-C - Essential C Libraries for Developers
 * Copyright (c) 2004-2008 Tom Bradford <tom@tbradford.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a 
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 * DEALINGS IN THE SOFTWARE.
 */

#include <stdlib.h>

#include "esc_stack.h"

/* Private Types and Variables ***********************************************/

/* Private Functions *********************************************************/

/* Public Functions **********************************************************/

esc_stack_t* esc_stack_new(esc_mem_t* mem)
{
    esc_stack_t* stack = esc_list_new(mem);
    
    esc_list_setClusterSize(stack, 32);
    
    return stack;
}

/*---------------------------------------------------------------------------*/

void esc_stack_push(esc_stack_t* stack, void* item)
{
    esc_list_addItem(stack, item);
}

/*---------------------------------------------------------------------------*/

void* esc_stack_pop(esc_stack_t* stack)
{
    int size = esc_list_getSize(stack);
    
    if ( size > 0 )
        return esc_list_removeIndex(stack, size - 1);
    else
        return NULL;
}

/*---------------------------------------------------------------------------*/

void* esc_stack_peek(esc_stack_t* stack)
{
    int size = esc_list_getSize(stack);
    
    if ( size > 0 )
        return esc_list_getItem(stack, size - 1);
    else
        return NULL;
}

/*---------------------------------------------------------------------------*/

void esc_stack_removeAll(esc_stack_t* stack)
{
    esc_list_removeAll(stack);
}

/*---------------------------------------------------------------------------*/

int esc_stack_getSize(esc_stack_t* stack)
{
    return esc_list_getSize(stack);
}

/*---------------------------------------------------------------------------*/

bool esc_stack_isEmpty(esc_stack_t* stack)
{
    return esc_list_isEmpty(stack);
}
